- Labor & Employment Consultants, Sylmar
- Labor Organizations, Sylmar
- Laboratories Medical, Sylmar
- Land Surveyor, Sylmar - Land Surveying Services
- Landscape Contractors & Designers, Sylmar
- Landscape Garden Services, Sylmar
- Landscaping, Sylmar
- Landscaping Materials & Supplies, Sylmar
- Late Night Restaurants, Sylmar
- Laundromats & Dry-Cleaning, Coin-Operated, Sylmar
- Laundry & Dry Cleaning Equipment & Supplies, Sylmar - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Self Service, Sylmar
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Sylmar
- Lawn & Garden Equipment & Supplies, Sylmar
- Lawn & Garden Services, Sylmar
- Lawn & Garden Sprinkler Systems, Sylmar
- Lawyers & Attorneys, Sylmar
- Leather Apparel Goods Manufacturers, Sylmar
- Leather Goods, Sylmar
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- Legal & Tax Services, Sylmar
- Legal Professionals, Sylmar
- Life Insurance, Sylmar
- Lighting Fixtures & Equipment, Sylmar
- Limousine Service, Sylmar
- Linens & Towels Manufacturers, Sylmar
- Liquor & Beer Manufacturers, Sylmar
- Liquor Stores, Sylmar
- Livestock, Sylmar
- Loans Personal, Sylmar
- Loans Title Services, Sylmar
- Locks, Sylmar
- Locksmiths, Sylmar - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Sylmar
- Lodging, Sylmar
- Logistics Freight, Sylmar
- Long Haul Trucking Companies, Sylmar
- Lutheran Church, Sylmar
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